One for loop to print diamond star

boringDiamondStar.cpp

#include <iostream>

int f(int x) {
    return (4) * ((x - 1) / (-1)) * ((x - 2) / (-2)) * ((x - 3) / (-3)) * ((x - 4) / (-4)) * ((x - 5) / (-5)) * ((x - 6) / (-6)) * ((x - 7) / (-7)) * ((x - 8) / (-8)) * ((x - 9) / (-9)) * ((x - 10) / (-10)) * ((x - 11) / (-11)) * ((x - 12) / (-12)) * ((x - 13) / (-13)) * ((x - 14) / (-14)) * ((x - 15) / (-15)) * ((x - 16) / (-16)) * ((x - 17) / (-17)) + ((x - 0) / (1)) * (1) * ((x - 2) / (-1)) * ((x - 3) / (-2)) * ((x - 4) / (-3)) * ((x - 5) / (-4)) * ((x - 6) / (-5)) * ((x - 7) / (-6)) * ((x - 8) / (-7)) * ((x - 9) / (-8)) * ((x - 10) / (-9)) * ((x - 11) / (-10)) * ((x - 12) / (-11)) * ((x - 13) / (-12)) * ((x - 14) / (-13)) * ((x - 15) / (-14)) * ((x - 16) / (-15)) * ((x - 17) / (-16)) + ((x - 0) / (2)) * ((x - 1) / (1)) * (3) * ((x - 3) / (-1)) * ((x - 4) / (-2)) * ((x - 5) / (-3)) * ((x - 6) / (-4)) * ((x - 7) / (-5)) * ((x - 8) / (-6)) * ((x - 9) / (-7)) * ((x - 10) / (-8)) * ((x - 11) / (-9)) * ((x - 12) / (-10)) * ((x - 13) / (-11)) * ((x - 14) / (-12)) * ((x - 15) / (-13)) * ((x - 16) / (-14)) * ((x - 17) / (-15)) + ((x - 0) / (3)) * ((x - 1) / (2)) * ((x - 2) / (1)) * (3) * ((x - 4) / (-1)) * ((x - 5) / (-2)) * ((x - 6) / (-3)) * ((x - 7) / (-4)) * ((x - 8) / (-5)) * ((x - 9) / (-6)) * ((x - 10) / (-7)) * ((x - 11) / (-8)) * ((x - 12) / (-9)) * ((x - 13) / (-10)) * ((x - 14) / (-11)) * ((x - 15) / (-12)) * ((x - 16) / (-13)) * ((x - 17) / (-14)) + ((x - 0) / (4)) * ((x - 1) / (3)) * ((x - 2) / (2)) * ((x - 3) / (1)) * (2) * ((x - 5) / (-1)) * ((x - 6) / (-2)) * ((x - 7) / (-3)) * ((x - 8) / (-4)) * ((x - 9) / (-5)) * ((x - 10) / (-6)) * ((x - 11) / (-7)) * ((x - 12) / (-8)) * ((x - 13) / (-9)) * ((x - 14) / (-10)) * ((x - 15) / (-11)) * ((x - 16) / (-12)) * ((x - 17) / (-13)) + ((x - 0) / (5)) * ((x - 1) / (4)) * ((x - 2) / (3)) * ((x - 3) / (2)) * ((x - 4) / (1)) * (5) * ((x - 6) / (-1)) * ((x - 7) / (-2)) * ((x - 8) / (-3)) * ((x - 9) / (-4)) * ((x - 10) / (-5)) * ((x - 11) / (-6)) * ((x - 12) / (-7)) * ((x - 13) / (-8)) * ((x - 14) / (-9)) * ((x - 15) / (-10)) * ((x - 16) / (-11)) * ((x - 17) / (-12)) + ((x - 0) / (6)) * ((x - 1) / (5)) * ((x - 2) / (4)) * ((x - 3) / (3)) * ((x - 4) / (2)) * ((x - 5) / (1)) * (1) * ((x - 7) / (-1)) * ((x - 8) / (-2)) * ((x - 9) / (-3)) * ((x - 10) / (-4)) * ((x - 11) / (-5)) * ((x - 12) / (-6)) * ((x - 13) / (-7)) * ((x - 14) / (-8)) * ((x - 15) / (-9)) * ((x - 16) / (-10)) * ((x - 17) / (-11)) + ((x - 0) / (7)) * ((x - 1) / (6)) * ((x - 2) / (5)) * ((x - 3) / (4)) * ((x - 4) / (3)) * ((x - 5) / (2)) * ((x - 6) / (1)) * (7) * ((x - 8) / (-1)) * ((x - 9) / (-2)) * ((x - 10) / (-3)) * ((x - 11) / (-4)) * ((x - 12) / (-5)) * ((x - 13) / (-6)) * ((x - 14) / (-7)) * ((x - 15) / (-8)) * ((x - 16) / (-9)) * ((x - 17) / (-10)) + ((x - 0) / (8)) * ((x - 1) / (7)) * ((x - 2) / (6)) * ((x - 3) / (5)) * ((x - 4) / (4)) * ((x - 5) / (3)) * ((x - 6) / (2)) * ((x - 7) / (1)) * (0) * ((x - 9) / (-1)) * ((x - 10) / (-2)) * ((x - 11) / (-3)) * ((x - 12) / (-4)) * ((x - 13) / (-5)) * ((x - 14) / (-6)) * ((x - 15) / (-7)) * ((x - 16) / (-8)) * ((x - 17) / (-9)) + ((x - 0) / (9)) * ((x - 1) / (8)) * ((x - 2) / (7)) * ((x - 3) / (6)) * ((x - 4) / (5)) * ((x - 5) / (4)) * ((x - 6) / (3)) * ((x - 7) / (2)) * ((x - 8) / (1)) * (9) * ((x - 10) / (-1)) * ((x - 11) / (-2)) * ((x - 12) / (-3)) * ((x - 13) / (-4)) * ((x - 14) / (-5)) * ((x - 15) / (-6)) * ((x - 16) / (-7)) * ((x - 17) / (-8)) + ((x - 0) / (10)) * ((x - 1) / (9)) * ((x - 2) / (8)) * ((x - 3) / (7)) * ((x - 4) / (6)) * ((x - 5) / (5)) * ((x - 6) / (4)) * ((x - 7) / (3)) * ((x - 8) / (2)) * ((x - 9) / (1)) * (1) * ((x - 11) / (-1)) * ((x - 12) / (-2)) * ((x - 13) / (-3)) * ((x - 14) / (-4)) * ((x - 15) / (-5)) * ((x - 16) / (-6)) * ((x - 17) / (-7)) + ((x - 0) / (11)) * ((x - 1) / (10)) * ((x - 2) / (9)) * ((x - 3) / (8)) * ((x - 4) / (7)) * ((x - 5) / (6)) * ((x - 6) / (5)) * ((x - 7) / (4)) * ((x - 8) / (3)) * ((x - 9) / (2)) * ((x - 10) / (1)) * (7) * ((x - 12) / (-1)) * ((x - 13) / (-2)) * ((x - 14) / (-3)) * ((x - 15) / (-4)) * ((x - 16) / (-5)) * ((x - 17) / (-6)) + ((x - 0) / (12)) * ((x - 1) / (11)) * ((x - 2) / (10)) * ((x - 3) / (9)) * ((x - 4) / (8)) * ((x - 5) / (7)) * ((x - 6) / (6)) * ((x - 7) / (5)) * ((x - 8) / (4)) * ((x - 9) / (3)) * ((x - 10) / (2)) * ((x - 11) / (1)) * (2) * ((x - 13) / (-1)) * ((x - 14) / (-2)) * ((x - 15) / (-3)) * ((x - 16) / (-4)) * ((x - 17) / (-5)) + ((x - 0) / (13)) * ((x - 1) / (12)) * ((x - 2) / (11)) * ((x - 3) / (10)) * ((x - 4) / (9)) * ((x - 5) / (8)) * ((x - 6) / (7)) * ((x - 7) / (6)) * ((x - 8) / (5)) * ((x - 9) / (4)) * ((x - 10) / (3)) * ((x - 11) / (2)) * ((x - 12) / (1)) * (5) * ((x - 14) / (-1)) * ((x - 15) / (-2)) * ((x - 16) / (-3)) * ((x - 17) / (-4)) + ((x - 0) / (14)) * ((x - 1) / (13)) * ((x - 2) / (12)) * ((x - 3) / (11)) * ((x - 4) / (10)) * ((x - 5) / (9)) * ((x - 6) / (8)) * ((x - 7) / (7)) * ((x - 8) / (6)) * ((x - 9) / (5)) * ((x - 10) / (4)) * ((x - 11) / (3)) * ((x - 12) / (2)) * ((x - 13) / (1)) * (3) * ((x - 15) / (-1)) * ((x - 16) / (-2)) * ((x - 17) / (-3)) + ((x - 0) / (15)) * ((x - 1) / (14)) * ((x - 2) / (13)) * ((x - 3) / (12)) * ((x - 4) / (11)) * ((x - 5) / (10)) * ((x - 6) / (9)) * ((x - 7) / (8)) * ((x - 8) / (7)) * ((x - 9) / (6)) * ((x - 10) / (5)) * ((x - 11) / (4)) * ((x - 12) / (3)) * ((x - 13) / (2)) * ((x - 14) / (1)) * (3) * ((x - 16) / (-1)) * ((x - 17) / (-2)) + ((x - 0) / (16)) * ((x - 1) / (15)) * ((x - 2) / (14)) * ((x - 3) / (13)) * ((x - 4) / (12)) * ((x - 5) / (11)) * ((x - 6) / (10)) * ((x - 7) / (9)) * ((x - 8) / (8)) * ((x - 9) / (7)) * ((x - 10) / (6)) * ((x - 11) / (5)) * ((x - 12) / (4)) * ((x - 13) / (3)) * ((x - 14) / (2)) * ((x - 15) / (1)) * (4) * ((x - 17) / (-1)) + ((x - 0) / (17)) * ((x - 1) / (16)) * ((x - 2) / (15)) * ((x - 3) / (14)) * ((x - 4) / (13)) * ((x - 5) / (12)) * ((x - 6) / (11)) * ((x - 7) / (10)) * ((x - 8) / (9)) * ((x - 9) / (8)) * ((x - 10) / (7)) * ((x - 11) / (6)) * ((x - 12) / (5)) * ((x - 13) / (4)) * ((x - 14) / (3)) * ((x - 15) / (2)) * ((x - 16) / (1)) * (1);
}

int main(int argc, char* argv[]) {
    for (int i = 0; i < 17; i += 2) {
        std::cout << std::string(f(i), ' ') << std::string(f(i + 1), '*') << std::endl;
    }
    return 0;
}

GenerateFx.cs

// https://github.com/CWKSC/Lagrange-Polynomial
// https://github.com/CWKSC/MyLib_Csharp

(double, double)[] points = { 
    (0, 4), 
    (1, 1), 
    (2, 3), 
    (3, 3), 
    (4, 2),
    (5, 5), 
    (6, 1),
    (7, 7),
    (8, 0),
    (9, 9),
    (10, 1),
    (11, 7),
    (12, 2),
    (13, 5),
    (14, 3),
    (15, 3),
    (16, 4),
    (17, 1)
};

LagrangePolynomial fx = new(points);

fx.Generate().Printlnln();